WhatsApp — Messaging
Hundreds of millions of persistent connections, the Signal protocol's X3DH and Double Ratchet, per-user inbox queues, sender keys for groups, and multi-device sync without the server reading anything.
Hundreds of millions of persistent connections, the Signal protocol's X3DH and Double Ratchet, per-user inbox queues, sender keys for groups, and multi-device sync without the server reading anything.